Child Seat

Does anyone out there have any experience with convertible child seats in an E46? I hear Recaro child seats have great safety ratings, but will it fit? I'm a pretty tall guy and it's a tight fit with our current infant carrier.

Update:
So we went ahead and purchased the Recaro Como (same size as Signo and Britax version) and had it sent to our house. We were all excited since children can stay backwards-facing in this seat much longer, which is safest. Then the seat arrived. It is GIGANTIC! The seat is SO tall that it blocks rear visibility. Not only does it not fit well backwards facing, but frontward was not much better. The only way this seat could be used in an E46 is if the passenger seat is completely forwards and never needed for a passenger.